Cobb quoted as the definitive authority...gotta love it!

Trout

----------
> From: ir002538@mi*.co*
> To: DavidP6418@ao*.co*; Tech Diver <techdiver@aquanaut.com>
> Subject: Re: nitrox
> Date: Wednesday, February 25, 1998 3:05 PM
> 
> Never dive ENAX mixes unless you have the capability to check them 
> yourself. See
> 
> http://www.cisatlantic.com/trimix/trimix.html
> 
> for more information.
> 
> On 2/22/98 6:15 PM DavidP6418@ao*.co* wrote:
> 
> >Dear List,
> >
> >I am a recent subscriber to the list and have a question that has been
> >bothering me for some time.
> >I am at the low tech end of tech diving.   I was nitrox certified 2 1/2
years
> >ago, primarily for increased bottom time and an increased safety factor.
  I
> >do four 60-80 dives in a day and nitrox has been a God send.  
Unfortunately,
> >I have come to the realization that the limiting factor in spearfishing
is 
> >now
> >my out of shape ass.
> >Anyway, I was going to a local dive shop for my nitrox fills, never
giving
> >them any consideration.   He would mark the oxygen percentage on the
tanks
> >with a magic marker written on a piece of tape.
> >Everything was great until two of my friends went to this dive shop to
> >themselves get nitrox certified.   They sat through the theory part of
the
> >class and towards the end of the evening, the instructor/dive shop owner
> >wanted to show the class how an oxygen analyzer works.   The previously 
> >filled
> >nitrox tanks were sitting along the side wall so he grabbed one of the
tanks
> >to show the class.   He measures the first tank and shows the class that
it
> >has 33% oxygen.   Unfortunately, the piece of tape on the tank says 32%.
  
> >The
> >next tank is also off by 1%.   The next tank is off by 1.5%, the next by
2%.
> >The final tank was off by 5%!
> >His explanation was that he had someone else do the fills.   The new
person
> >did not wait long enough between the time the tank was filled to do the 
> >oxygen
> >measuring.   He says that the additional time is needed so the oxygen
can 
> >mix.
> >Has anyone ever heard of such a thing?
> >BTW, since this occurred, I felt I could no longer trust this guy.   I
have
> >four six foot oxygen tanks in my garage which I use to pump up our
nearly
> >empty tanks to about 1000 lbs of oxygen   I bring these tanks to the
dive 
> >shop
> >(with his knowledge of what I am doing) and have him fill them.   Once 
> >home, I
> >then measure the tanks myself for their oxygen content.
> >I would appreciate the list's comments.
> >
> >Thanks much,
> >
> >Dave P
> >Bonita Springs FL
> >--
> >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
> >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
> 
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